Eileen, the founder of Mandarin Corner, provides a variety of content for beginner and intermediate learners to train their listening comprehension, improve their grammar, expand their vocabulary, and help them understand Chinese culture. She sometimes dedicates episodes to specific grammar points or interviews locals about different topics. Because she speaks with so many different people, you will be able to train your ear to understand different accents. Eileen will help you understand the nuances of the language, must-know sentence structures, and even spend an hour helping you understand the many different measure words.
You can watch videos that focus on conversation, HSK content, slow intermediate Chinese with literal translations, stories, and reading practice. On the website you can also listen to audio episodes with a PDF transcript, use flashcards, download the Youtube videos, or watch videos without English translations. Some of this content is only available with a one-time $10 donation, but after the donation you will have access to the content forever.
Overall, Mandarin Corner is an excellent resource with a variety of high-quality and engaging material.